Colloidal quantum dot materials have pertinent applications in optoelectronic devices such as solar cells and photodetectors. Photocarrier radiometry technology is used to determine the exciton transport characteristics of a PbS colloidal quantum dot film containing trap states. A theoretical model ignoring net carrier transport between quantum dots is established, and the effects of exciton transport characteristics on photocarrier radiometry signals are subsequently simulated and analyzed. Finally, by conducting a frequency sweeping photocarrier radiometry experiment with different excitation powers, combined with the established exciton transport model, a variety of material parameters such as the effective exciton lifetime, carrier capture rate, and decapture lifetime are extracted. The experimental results confirm the validity of the proposed theoretical model.